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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 26 · 40 questions
TalentJR

The method (Round, then calculate): Round each number to the nearest ten, hundred or whole number. Do the easy sum with the rounded numbers. Pick the option nearest to it. To round a number, look at the digit after the place you keep: 5 or more goes up, less than 5 stays.

NameDateTime takenScore ___ / 40
  1. 1.Which is closest to 800 × 22? (Round each number first.) (a) 16000 (b) 160000 (c) 1600 (d) 32000
  2. 2.Round 86471 to the nearest hundred.
  3. 3.Which is closest to 197 × 58? (Round each number first.) (a) 12000 (b) 1200 (c) 120000 (d) 24000
  4. 4.Which is closest to 101 + 202 + 303? (a) 800 (b) 700 (c) 600 (d) 500
  5. 5.Round 53199 to the nearest hundred.
  6. 6.Which is closest to 797 × 42? (Round each number first.) (a) 320000 (b) 64000 (c) 32000 (d) 3200
  7. 7.Which is closest to 897 × 90? (Round each number first.) (a) 8100 (b) 810000 (c) 162000 (d) 81000
  8. 8.Round 74309 to the nearest ten.
  9. 9.Which is closest to 3202 ÷ 41? (a) 800 (b) 160 (c) 40 (d) 80
  10. 10.Which is closest to 396 × 19? (Round each number first.) (a) 800 (b) 16000 (c) 8000 (d) 80000
  11. 11.Which is closest to 2107 ÷ 31? (a) 70 (b) 35 (c) 140 (d) 700
  12. 12.Which is closest to 196 × 81? (Round each number first.) (a) 32000 (b) 160000 (c) 1600 (d) 16000
  13. 13.Which is closest to 394 ÷ 21? (a) 20 (b) 200 (c) 10 (d) 40
  14. 14.Round 8016 to the nearest hundred.
  15. 15.Round 97.72 to one decimal place. =
  16. 16.Which is closest to 296 × 50? (Round each number first.) (a) 1500 (b) 150000 (c) 30000 (d) 15000
  17. 17.Round 34287 to the nearest hundred.
  18. 18.Which is closest to 799 + 98 + 404? (a) 1300 (b) 1400 (c) 1200 (d) 1500
  19. 19.Which is closest to 702 + 700 + 98? (a) 1600 (b) 1500 (c) 1700 (d) 1400
  20. 20.Which is closest to 902 × 58? (Round each number first.) (a) 108000 (b) 5400 (c) 540000 (d) 54000
  21. 21.Round 22.92 to one decimal place. =
  22. 22.Which is closest to 1194 ÷ 19? (a) 120 (b) 30 (c) 60 (d) 600
  23. 23.Which is closest to 1999 ÷ 51? (a) 80 (b) 20 (c) 40 (d) 400
  24. 24.Round 49.33 to one decimal place. =
  25. 25.Which is closest to 2797 ÷ 41? (a) 35 (b) 700 (c) 70 (d) 140
  26. 26.Round 13360 to the nearest hundred.
  27. 27.Round 37.07 to one decimal place. =
  28. 28.Which is closest to 1191 ÷ 29? (a) 20 (b) 400 (c) 40 (d) 80
  29. 29.Round 86316 to the nearest thousand.
  30. 30.Round 64.71 to one decimal place. =
  31. 31.Round 21340 to the nearest hundred.
  32. 32.Which is closest to 804 + 696 + 795? (a) 2500 (b) 2200 (c) 2300 (d) 2400
  33. 33.Round 57761 to the nearest ten.
  34. 34.Which is closest to 604 × 41? (Round each number first.) (a) 48000 (b) 24000 (c) 240000 (d) 2400
  35. 35.Which is closest to 904 × 69? (Round each number first.) (a) 6300 (b) 126000 (c) 63000 (d) 630000
  36. 36.Which is closest to 195 + 102 + 397? (a) 900 (b) 800 (c) 600 (d) 700
  37. 37.Round 10426 to the nearest thousand.
  38. 38.Which is closest to 497 × 62? (Round each number first.) (a) 60000 (b) 30000 (c) 3000 (d) 300000
  39. 39.Round 37958 to the nearest thousand.
  40. 40.Which is closest to 401 × 78? (Round each number first.) (a) 320000 (b) 3200 (c) 64000 (d) 32000

Answer key

  1. 16000
  2. 86500
  3. 12000
  4. 600
  5. 53200
  6. 32000
  7. 81000
  8. 74310
  9. 80
  10. 8000
  11. 70
  12. 16000
  13. 20
  14. 8000
  15. 97.7
  16. 15000
  17. 34300
  18. 1300
  19. 1500
  20. 54000
  21. 22.9
  22. 60
  23. 40
  24. 49.3
  25. 70
  26. 13400
  27. 37.1
  28. 40
  29. 86000
  30. 64.7
  31. 21300
  32. 2300
  33. 57760
  34. 24000
  35. 63000
  36. 700
  37. 10000
  38. 30000
  39. 38000
  40. 32000

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